1、Designation: C1481 12Standard Guide forUse of Joint Sealants with Exterior Insulation and FinishSystems (EIFS)1This standard is issued under the fixed designation C1481; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide describes the use of single and multi-component, cold-applied joint sealants, or precured sealantsystems for
3、 joint sealing applications, or both, in buildingsusing Exterior Insulation and Finish Systems (EIFS) on one orboth sides of the joint. Refer to 10.1 for joint seal geometries.1.2 The elastomeric sealants described by this guide meetthe requirements of Specifications C834, C920,orC1311.1.3 The value
4、s stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safe
5、ty and health practices and determine the applica-bility of regulatory limitations prior to use.1.5 There are no ISO standards similar or equivalent to thisASTM standard.2. Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsC719 Test Method for Adhesion and Cohesi
6、on of Elasto-meric Joint Sealants Under Cyclic Movement (HockmanCycle)C794 Test Method for Adhesion-in-Peel of ElastomericJoint SealantsC834 Specification for Latex SealantsC920 Specification for Elastomeric Joint SealantsC1193 Guide for Use of Joint SealantsC1311 Specification for Solvent Release S
7、ealantsC1382 Test Method for Determining Tensile AdhesionProperties of Sealants When Used in Exterior Insulationand Finish Systems (EIFS) JointsC1397 Practice for Application of Class PB Exterior Insu-lation and Finish Systems (EIFS) and EIFS with DrainageC1472 Guide for Calculating Movement and Oth
8、er EffectsWhen Establishing Sealant Joint WidthE2110 Terminology for Exterior Insulation and Finish Sys-tems (EIFS)E2511 Guide for Detailing of EIFS-Clad Wall AssembliesE2568 Specification for PB Exterior Insulation and FinishSystems2.2 ANSI Standard:American National Standard for Exterior Insulatio
9、n andFinish Systems (EIFS)33. Terminology3.1 Definitions:3.1.1 Refer to Terminology C717 for definitions of thefollowing terms used in this guide: bicellular sealant backing,bond breaker, bridge sealant joint, butt sealant joint, chemi-cally curing sealant, closed cell sealant backing, compatibility
10、,compatible materials, cure, elastomeric, elongation, fillet seal-ant joint, joint, lap sealant joint, latex sealant, modulus,non-sag sealant, open cell sealant backing, precured sealant,primer, seal, sealant, sealant backing, shelf-life, solvent-release sealant, shrinkage, substrate, tooling, tooli
11、ng time,working life (pot life).3.1.2 Refer to Terminology E2110 for definitions of thefollowing terms used in this guide: accessories, base coat,cure, dry, durability, edge wrap, embed, expansion joint,exterior insulation and finish system (EIFS), finish coat,lamina, nonmetallic reinforcing mesh, p
12、rimers, reinforced basecoat, substrate, texture, thermal insulation board, wrap.4. Significance and Use4.1 The intent of this guide is to provide information andguidelines for consideration by the designer or applicator ofjoint seals in, or adjacent to, EIFS. Refer to SpecificationE2568 for addition
13、al information pertaining to specifying ClassPB EIFS. Refer to Guide E2511 for additional informationpertaining to detailing of EIFS-Clad Wall Assemblies.1This guide is under the jurisdiction ofASTM Committee C24 on Building Sealsand Sealants and is the direct responsibility of Subcommittee C24.10 o
14、n Specifi-cations, Guides and Practices.Current edition approved June 1, 2012. Published June 2012. Originallyapproved in 2000. Last previous edition approved in 2011 as C1481-11. DOI:10.1520/C1481-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Servi
15、ce at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.1Copyright ASTM International, 100 Barr Harbor Drive,
16、 PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 Proper selection and use of a sealant is fundamental toits ultimate performance, service life, and durability. A sealantjoint subjected to movement and other similar performancefactors should be designed for the particular application
17、 toavoid compromising its performance capability and causingfailures. Refer to C1193 for guidance.4.3 In addition to the design and installation data in thisguide, consult the sealant manufacturer about applications forits products and their proper use and installation.5. General5.1 The major compon
18、ents of a joint seal in, or adjacent to,EIFS that should be considered when selecting or usingsealants are as follows: EIFS, primer, sealant backing orbond-breaker, adjacent substrates and sealant (see Figs. 1-11).NOTEThis legend applies to Figs. 1-11LegendA. SealantB. Sealant BackingC. Bond Breaker
19、D. Joint WidthE. Finish CoatF. Reinforcing Mesh Embedded in BaseCoatG. Wrapped Mesh Embedded in BaseCoatH. Insulation BoardI. Adjacent SubstrateJ. Sealant BeadK. Manufacturers Primer or Paint Coat-ing (if required)L. Trim AccessoryM. Precured SealantN. Existing Sealant Joint with OptionalCut Down th
20、e Middle5.2 EIFS presents a substrate that may be acceptable forsealant adhesion if the sealant joint is properly designed inaccordance with the EIFS and sealant manufacturer recommen-dations. Most EIFS manufacturers recommend adhering seal-ant directly to the base coat or primed base coat and avoid
21、ingadhesion to the finish coat, which can soften on exposure tomoisture and lose cohesion as the sealant extends and exerts astress on the finish coat. Typically, a sealant that has a lowmodulus should be used. A low modulus sealant will have alower stress at the sealant and substrate interface when
22、 the jointis in extension.FIG. 1 Sealant Butt Joint Seal (EIFS to EIFS)FIG. 2 Sealant Butt Joint Seal (EIFS to Dissimilar Substrates)FIG. 3 Recessed Sealant Butt Joint Seal (EIFS to EIFS)FIG. 4 Sealant Butt Joint Seal (Accessory to Accessory)C1481 122NOTE 1References4,5,6provide information pertaini
23、ng to the evalua-tion of various sealants with EIFS, factors affecting durability of sealantsin contact with the finish coating of EIFS, and thermal movement analysisfor panelized PB EIFS Claddings.5.3 Due to the difficulty that can be encountered in perform-ing remedial work for an EIFS sealant joi
24、nt, the selected4Yarosh, K. F., “Evaluation of Various Sealants with EIFS,” Science andTechnology of Building Seals, Sealants, Glazing, and Waterproofing - SeventhVolume, ASTM STP 1334, J. M. Klosowski, Ed., ASTM International, 1998, pp.169-178.5Kenney, R. J., and Piper, R. S., “Factors Affecting th
25、e Durability of Sealants inContact with the Finish Coating of EIF Systems,” Science and Technology ofBuilding Seals, Sealants, Glazing, and Waterproofing, ASTM STP 1168, C. J. Parise,Ed., ASTM International, 1992, pp. 117127.6Williams, M. F., and Williams, B. L., “Thermal Movement Analyses forPaneli
26、zed Polymer-Based Exterior Insulation and Finish System (PB EIFS) Clad-dings,” Science and Technology of Building Seals, Sealants, Glazing, and Water-proofing, ASTM STP 1168, C. J. Parise, Ed.,ASTM International, 1992, pp. 128-138.FIG. 5 Sealant Butt Joint Seal (Accessory to DissimilarSubstrate)FIG.
27、 6 Sealant Bridge Joint Seal Using LiquidApplied Sealantand Bond BreakerFIG. 7 Sealant Bridge Joint Seal Using Precured SealantFIG. 8 Sealant Fillet Joint Seal With Bond BreakerFIG. 9 Sealant Fillet Joint Seal With Triangular Sealant BackingFIG. 10 Sealant Fillet Joint Seal Using Precured SealantFIG
28、. 11 Sealant Lap Joint SealC1481 123sealant should have very good environmental weatheringcharacteristics so that it will last for the maximum usefullifetime of the sealant. Since an EIFS system is water-based, ifit becomes saturated with rainwater or snow melt, the adhesionof a sealant to an EIFS b
29、ase coat can be lessened. Informationon sealant tensile adhesion properties when used with EIFS canbe found in Test Method C1382. EIFS can be damaged bygrinding or cutting during sealant removal, so it is a goodcandidate for use of a bridge type sealant joint or precuredsealant, in a remedial applic
30、ation. This may be helpful since itdoes not require the removal of all the old or failed sealant butdoes change the appearance of the joint seal.6. EIFS6.1 Joint Location and ConfigurationIn an EIFS-cladbuilding, sealant joints typically are required at the followinglocations:6.1.1 At the floor line
31、 of multi-level wood frame construc-tion;6.1.2 At an existing building expansion joint;6.1.3 Where dissimilar substrates form the joint;6.1.4 When an EIFS abuts dissimilar building construction;6.1.5 Some EIFS manufacturers may require movementjoints in long continuous elevations;6.1.6 The size and
32、location of joints is the responsibility ofthe design professional and shall be consistent with the projectconditions and guidelines of the EIFS manufacturer.6.1.7 Joint ConfigurationThe EIFS Industry acceptedminimum joint width for EIFS applications is 19 mm withsufficient depth to accommodate the
33、sealant backing andsealant material. Some EIFS manufacturers may permit jointwidths that are less than 19 mm. Consider the sealant manu-facturers published sealant movement capability when deter-mining the appropriate joint width. Refer to Guide C1472 foradditional information on establishing the se
34、alant joint size.Good architectural practice calls for joint designs that allow forconstruction tolerances and material variations.6.2 EIFS InstallationThe EIFS manufacturers recom-mended installation procedures should be followed at all times.6.2.1 Practice C1397 provides a minimum requirement fort
35、he application of Class PB EIFS.6.2.2 Exposed edges of thermal insulation board whichcreate the sides of the joint must be protected by wrapping theedge with base coat and reinforcing mesh, trim accessory, orother method specified by the EIFS manufacturer.6.2.2.1 Encapsulation of the exposed edges o
36、f the thermalinsulation board with nonmetallic reinforcing mesh in the basecoat is referred to as wrapping. There shall be no exposedthermal insulation or mesh at joint locations or elsewhere.6.2.2.2 EIFS manufacturers may require the use of anaccessory to terminate a joint (see Figs. 4 and 5). Wher
37、e anEIFS manufacturers approved trim accessory is used as atermination and sealant substrate, wrapping may not be re-quired.6.2.3 The base coat portion of the lamina for the EIFS mustbe allowed sufficient time to cure or dry before the applicationof sealants. A minimum drying time of 24 h is require
38、d.Curing/drying time may be affected by environmental condi-tions as well as whether the EIFS base coat is cementitious ornoncementitious. Consult EIFS manufacturer for recommen-dations for appropriate curing/drying time.6.2.4 Some EIFS manufacturers require a primer or paintcoating over the base co
39、at within the joint. The primer,provided by the EIFS manufacturer, may be used to promotesealant adhesion, protect cementitious base coat from efflores-cence and/or provide color uniformity.6.2.5 The application of finish coat into the joint is generallynot recommended by EIFS manufacturers. The tes
40、t methoddescribed in Test Method C1382 allows evaluation of a specificsealant to a specific EIFS substrate.6.2.6 Careful consideration should be given to the construc-tion sequencing of the EIFS finish coat, EIFS primer or paintcoating, and sealant application as well as the termination ofthe EIFS f
41、inish coat relative to the joint.6.3 EIFS Joint Preparation:6.3.1 Joints must be clean, dry, and free of frost or othersurface contaminants.6.3.2 Generally, joints shall be cleaned with a nonmetallicstiff bristle brush or oil-free compressed air. Solvents may beincompatible with the EIFS or underlyi
42、ng thermal insulationboard. Consult the EIFS manufacturer to determine if a specificsolvent is compatible with their EIFS.6.3.3 Repair deteriorated or damaged substrates as recom-mended by the manufacturer to provide a suitable substrate forthe sealant.7. Sealant Primer7.1 The general purpose of a s
43、ealant primer is to improveadhesion of a sealant to the EIFS substrate.7.1.1 In accordance with Test Methods C794 and C1382,determine whether a sealant primer is required to a specificEIFS substrate or accessory.7.1.2 Sealant primer shall not cause damage to the EIFSlamina and underlying thermal ins
44、ulation board.7.1.3 When selecting a sealant for joints between EIFS anda dissimilar substrate, two different primers may be required.This poses a difficult application problem and should be takeninto consideration when selecting a sealant.7.1.4 Apply sealant primer in accordance with the sealantman
45、ufacturers recommendations and allow the sealant primerto cure or dry as recommended by the manufacturer beforeinstalling sealant backing and sealant.8. Sealant Backing or Bond Breaker8.1 Proper joint design requires the use of appropriatesealant backing to prevent three-sided adhesion, allow toolin
46、gof the sealant and control joint profile. Closed cell andbicellular sealant backings are generally accepted by EIFSmanufacturers. Open cell sealant backing, such as open cellpolyurethane, can absorb and retain water, which may cause adeleterious effect on the EIFS and are not recommended byEIFS man
47、ufacturers.8.1.1 Where sealant backing cannot be installed, a bondbreaker must be applied to prevent three sided adhesion.9. Sealant9.1 The sealant shall be selected based on the environmentalconditions in which it will be used. Test Method C1382C1481 124evaluates the performance of sealants with EI
48、FS in a variety ofconditions. Results of this test provide information to thedesign professional as to which sealant may be the mostappropriate for its end use.9.1.1 Sealant types and classifications are discussed inGuide C1193.9.1.2 Section 10.1.4 on Self-Leveling of Guide C1193 doesnot apply.9.1.3
49、 Section 10.10.5 on Tooling Liquids of Guide C1193does not apply when sealants are used with EIFS.9.2 The EIFS industry generally recommends the use of alow modulus sealant. Refer to the EIFS manufacturer for therecommended elongation and compression capability.9.3 The selection of the sealant to be used is the responsi-bility of the design professional and shall be consistent withproject conditions and guidelines of the EIFS manufacturer.See Guide C1472 for guidance.10. Joint Seal Geometry10.1 Sealant joint seals may have any of four joint sealgeometry types: butt joi
